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fF. W-. SEABURY.

, DENTAL VULGANIZBR.

1\To.,295,821.` PatentedMar. 25, 1884.

FIEME.

- ANirnn *rares FREDERICK NV. SEABURY, OF PROVIDENCE, RHODE ISLAND.

DENTAL VULCANIZER.

SPECIFICATION forming partof Letters P atelit No. 295,821, dated March25, 1884.

Application filed October 19, 1883. (No model.)

.T all whom t may concern:

Beit known that l, FREDERICK W. SEABURY,

' hereby declare the following to be a full, clear,

i to heat, so as to vulcanize the soft rubber or and exact descriptionof the same, reference beinghad to the accompanying drawings, formingpart of this specification.

This invention has reference to an improvement in ovens or heaters intowhich one or more dental ilasks can be placed and subjected othercompound.

` The invention consists in the peculiar' and novel construction of theoven and the Isteamgenerator connected with the same, by which theproducts of combustion and the steampipes surround the oven, and thesteam can be admitted to the oven or heater, so that any desired degreeof heat, with or without moisture, can be obtained in the oven, and twoor more flasks can be vulcanized at the same time, as will be more fullyset 'forth hereinafter. i

` Vhen artificial teeth are to be inserted into artificial gums made ofindia-rubber or of celluloid, the gums are placed into what are known asdental flasks7 andthe teeth are inserted into the gum. This operation isperformed in the oven While the iiask is subjected to heat, and the bestresults are obtained at a temperature of from .300 to 330C. Fahrenheit.

While the flask is exposed to this high temperature, it must be forcedtogether by press-` ure until the flask is entirely closed, when the twoparts may be secured together and the process of vulcanizationcontinued. The

i first operation described above is preferable WhenV performed under adry heat and before steam is admitted to the oven or heater, and

this operation has to be carefully Watched, so

In the drawings, A is a conical case forming the support of the device.It consists of the standards c, the rings a', to which the standards aresecured, the outer sheet-metal casing, a2, and a lining of ashestus orother soW-conducting material, a3, by which the heat from the gas-burneris retained Within the casing and utilized in heating the oven.

B is the steam-generator, constructed like an ordinary vertical tubularsteam-boiler.

b b are tubes open at each end, so that the products of combustion froma gas-burner placed underneath the steam-generator can pass through thesame.

b b are tubes extending from the top of the steamgenerator to thesteam-chamber C, partially or` Wholly surrounding the upper endiof theoven or heater D. .Two steam pipes or tubes b b are shown in thedrawings, but a greater number may be used. d is the cover of the ovenD.This cover is providedwith thesightopening d', protected with a glassplate. The

bolt-holes d are large i enough at one end so that the heads of thebolts can pass through them, and the cover can be removed by partiallyrotating and lifting it Without removing v the bolts. d are openingsprovided With a hinged cover, which can be readily opened and closed.

d* are the screws by which pressure is exerted on the flask during theprocess of heating and closing the same.

E E are the fiasks, the upper one of which is shown as partly closed andresting on a plate supported by brackets extending from the sides of theoven D. The screws d4 d* are shown bearing against the cover' oftheupper ask. When this process is completed, each ask is lowered into theoven until, as shown in Fig. 1, the oven is full, when the last one isleft in its place, and, preferably, a plain cover is secured in place ofthe cover d. The

steam-valve F is now opened and steam is admitted into the oven so as tosurround the iiasks. A

It Will be observed that the products of IOO combustionsurround the ovenD, the steampipes b b', and the upper part of the steamgenerator B. Thesteam is thereby superheated and a higher temperature secured, by whichthe process of vulcanization is much facilitated. y

f is ab'low-off cock. gis asa'fet-y-valve, and h a steam-gage.

A thermometer may be inserted through either of the holes d3 d3,- or onemay be permanently secured in each or either of the covers to measurethe temperature.

The upper flange, c, of the oven D is faced true, so as to secure atight joint between the same and the cover. Any suitable packing Vmay beused to facilitate the making of a tight joint and prevent the escape ofsteam. l A It is obvious that this apparatus canbe heated by gas, bykerosene, or an alcohol lamp, and that with either kind oflanipthe heatgenerated is most thoroughly used in heating the oven, both directly andby the steam generated. Whenthe process of vulcanization is completed,the steam-valveF is closed and the liasks are removed; to repeat theprocess of molding, veach ilaskis replaced, as before described, untilthe same is lirmly closed, thus lagain filling the oven7 when steam isturned on again to complete the process of vulcanizing.- As two, four,or'more flasks are operated upon at one time, much saving in timeresults, and much :more work can be done in one apparatus. Greatstrength is secured in this construction of the dental vulcanizer, nofiat or large surfaces being subjected to the steam-pressure. A highpressure of steam can therefore be used with perfect safety.

The boiler can be readily lilled by either removing the safety-valve orby providing a separate inlet closed by a valve or cock.

Having thus described my invention, l claim as new and desire to secureby Letters Patentl. ln a dental vulcanizer, the combination, with theoven or heater D and cover d, of the steam-generator B, the steam-tubesb b', the steam-valve F, and the case A, inclosing the whole, asdescribed. v

2. In a dental vulcanizer, the combination,

lwith the case A, constructed to support the 4. The combination, withthe case A, the

oven D, constructed to receive two or more flasks successively and exertpressure on each during the process of molding, of the steamboiler B,the tubes Z1 b', valve F, and the case A, inclosing the whole andsupporting the boiler above the burner, as described.

5. The combination, with the oven D, steamboiler B, and tubes b b, ofthe steam-space C, partially or wholly surrounding the upper end of theoven, as described.

6. The combination, with the oven D, constructed to receive two or moreflasks, of the cover d, provided with the glass-covered opening d, theopenings d d3, and the screws d* dt, constructed to force the two partsofthe llask together, as described.

7. The combination, with the oven D and the cover d, provided with thescrews d'L (1*, of a shelf constructed to support the ask during theprocess of molding and allow a ilask to be passed below the support, asdescribed.

FREDERICK j W. SE ABURY.

Vitnesses:

M. F. Buen, J. A. MILLER, Jr.

